Java11，MalformedByteSequenceException 应该用什么代替？

Question

I'm moving a project to Java11

I already changed sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl with java.lang.reflect.ParameterizedType (as specified here ), now is the turn of MalformedByteSequenceException :

warning: MalformedByteSequenceException is internal proprietary API and may be removed in a future release import com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException;

it's being use in a snippet of code that create objects from XML files. More precisely in a try-catch .

    try {
        ...
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(stream);

        NodeList list = document.getChildNodes();

        fillProcessStack(document);
        ...
        list = list.item(0).getChildNodes();
        createItems(list, parent);

    } catch (MalformedByteSequenceException e) {
        //"Any char in your xml file has a wrong format: " + e.getLocalizedMessage()
    } catch (SAXParseException sax) {
        ...
    } catch (Exception e) {
        ...
    }

Anyway I cant find anything online regarding this.

The closest I can think of is UnsupportedEncodingException , but I'm not sure.

Also, it's possible this is a relict of some old code copied from the net, and apparently if I remove it everything looks still fine for the compiler.

So, is there any general/good recommendations about it regarding Java11?

Edit: for the guy seeking to close this question because

Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Reproducible Example.

I'll try to be explain clearer.

There is no debugging help here, in Java11 some packages are not exported to public, like sun.* and they shouldnt be used normally (unless specific conditions). Code works fine under jdk8, but under ojdk11 it complains, so I could either use some workarounds to make them visible anyway at runtime or make it right and get rid of them. The latter is what I'm trying to do. Given I couldn't find anything online, I'm asking here.

Answer 1

MalformedByteSequenceException extends CharConversionException , which extends IOException , which the parse method forces you to catch anyway. So when catching IOException or CharConversionException , you'll also catch MalformedByteSequenceException if thrown directly.

However there seems to be a behavioral change of the XML parser in JDK 11. When I try, eg

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new ByteArrayInputStream(new byte[] { 1, 2, 3, -5 }));

I get

Exception in thread "main" org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Invalid byte 1 of 1-byte UTF-8 sequence.
        at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:262)
        at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339)
        at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:122)
        at TestXmlParser.main(TestXmlParser.java:14)
Caused by: com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 1 of 1-byte UTF-8 sequence.
        at java.xml/com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:702)
        at java.xml/com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:568)
        at java.xml/com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1904)
        at java.xml/com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.arrangeCapacity(XMLEntityScanner.java:1770)
        at java.xml/com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.skipString(XMLEntityScanner.java:1808)
        at java.xml/com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:158)
        at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:860)
        at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:824)
        at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:246)
        ... 3 more

instead of the

Exception in thread "main" com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 1 of 1-byte UTF-8 sequence.
        at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:684)
        at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:554)
        at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1742)
        at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.arrangeCapacity(XMLEntityScanner.java:1619)
        at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.skipString(XMLEntityScanner.java:1657)
        at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:193)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:772)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
        at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:232)
        at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)
        at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:124)
        at TestXmlParser.main(TestXmlParser.java:14)

of previous versions.

In other words, parse now throws a SAXParseException with a cause initialized to a MalformedByteSequenceException . So, to detect that the problem is a malformed byte sequence, resp. text in the wrong encoding, you'd need something like

catch(SAXException ex) {
    if(ex.getCause() instanceof CharConversionException) {
        System.out.println("maformed bytes or wrong encoding: "+ex.getMessage());
    }
}

To handle newer and older versions, you'd need something like

catch(CharConversionException ex) {
    System.out.println("malformed bytes or wrong encoding: "+ex.getMessage());
}
catch(SAXException ex) {
    if(ex.getCause() instanceof CharConversionException) {
        System.out.println("malformed bytes or wrong encoding: "+ex.getMessage());
    }
}

resp.

catch(CharConversionException ex) {
    handle(ex);
}
catch(SAXException ex) {
    if(ex.getCause() instanceof CharConversionException) {
        handle((CharConversionException)ex.getCause());
    }
}

…

static void handle(CharConversionException ex) {
    // just an example
    System.out.println("malformed bytes or wrong encoding: "+ex.getMessage());
}